P24F1

Code

Generic P — Powertrain

Control Module Wake-up Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 27 EN: 38 RU: 30

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Page language: EN

Causes

Short to battery or other power source on the wake-up/wake-line
Shorted or damaged wiring harness or connector (insulation chafing, pin contact)
Faulty control module or module wake driver transistor
Incorrect aftermarket device or accessory wiring tying into wake circuit
Intermittent connection or corrosion at connector or ground
Faulty body control module (BCM) or power control module generating incorrect logic level

Symptoms

Modules fail to enter sleep (battery drain / parasitic draw)
Unexpected module wake-ups or inability to sleep
Intermittent or lost communication with other modules
Battery parasitic discharge or low battery after park
Related warning lights or erratic electrical behavior

What to check

Use a scan tool to read live data and freeze frame, confirm P24F1 active and which module logged it
Check battery voltage and condition before diagnostics
Visually inspect wiring and connectors for the wake circuit, look for pin damage, corrosion, or aftermarket splices
Back-probe the wake wire and measure voltage with key off and key on (see signal parameters)
Check for DTCs in other modules that indicate communication/wake issues
Disconnect suspected aftermarket devices and re-test

Signal parameters

Wake line expected voltage when module asleep: typically
Wake line expected voltage when awake: approximately battery voltage (~9–16 V depending on system) or a logic high per manufacturer spec
Fault condition: wake line reads near battery voltage when it should be low (e.g., >2–4 V and often near 12 V)
Typical wake line impedance to ground when asleep: high (kΩ range); a low-ohm reading may indicate a short to battery or stuck driver

Diagnostic algorithm

Confirm the fault with a scan tool, record freeze-frame data and note which module reported P24F1.
Check battery voltage and charging system; ensure stable supply before further tests.
Inspect harness and connectors for the suspected module and trace the wake-up circuit for visible damage or aftermarket taps.
With ignition off, back-probe the wake wire at the module connector and measure voltage. If voltage is high when it should be low, suspect a short to battery or stuck driver.
Isolate the circuit: disconnect the module connector and measure the wake wire voltage at the harness side. If voltage drops to low, the module is likely the source; if still high, the short is upstream.
Wiggle testing: with harness disconnected and ignition in appropriate state, gently move harness to find intermittent shorts or opens. Do not simulate loads that could damage circuits.
If a short to battery is present on the harness side, visually and sniff-test for insulation damage, repair harness or connector as required, then clear codes and retest.
If the harness is OK and the wake line only reads high when the module is connected, consult module replacement/repair procedures and verify updates for known software issues before replacing the module.
After repair, erase codes, cycle ignition and verify the module enters sleep/wake normally and no parasitic drain remains.

Likely causes

Wake-up wire shorted to ignition or constant battery feed
Damaged connector pins allowing battery voltage onto the wake line
Faulty module output transistor stuck on (internal short)
Aftermarket alarm/remote start incorrectly wired to wake circuit

Fault status

⚠️ Status

Control module detected the wake-up circuit voltage is higher than the allowable threshold when the module should be in sleep/low-power state. Possible short to battery, faulty wake driver, or wiring/connector fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2 hours